A duffle coat is a coat made from duffel cloth, designed with toggle-and-rope fastenings, patched pockets and a large hood to protect from weather.
The Seventh Doctor wore a dark tan duffel coat over his usual attire during his visit to Maiden's Point. (TV: The Curse of Fenric)
Nardole wore a rust orange duffel coat. (TV: The Husbands of River Song, The Lie of the Land)